Email search for CPA firms: finding what the firm told a client two years ago

A CPA firm finds past client email fastest by asking first who at the firm sent it. If it was you, search your own Sent mail with three handles: the client, the year and one word from the advice. If it was a colleague, they run the same search in their mailbox. If it was somebody who has left, your administrator opens their old mailbox or searches the firm’s archive. If you know what the advice was but not how it was worded, an AI search can read the mail, answer in a sentence and link you to the source.

The question usually arrives sideways. A client writes in October: “Your office told us in 2024 we didn’t need a fourth-quarter estimate. Now there’s a penalty.” Somebody at the firm did write to them two years ago. You want the exact words before you reply, and you’d like them before lunch.

That’s a normal day at a firm, and the email is almost always still there. This guide covers where it lives, the searches to copy, what to do when the sender has left, and a subject-line habit that makes the next search take seconds.

Email search for CPA firms: start with who sent it

A sole practitioner has one mailbox to search. A firm has one per person, plus whatever the firm kept for people who left. So the first question isn’t what to type. It’s whose mail to type it into.

Most of the time it’s row one or row two. Start there, and work down only when you come up empty.

If you weren’t copied, ask the colleague for the thread. A forward of the last message carries most of the history as quoted text. Picking up a thread a colleague started covers what a forward drops and how to fill the gaps.

Searches to copy for a prior-year question

You’ll rarely remember the subject line. You’ll remember the client, roughly when, and what the advice was about. Those three handles find almost anything.

The example client is Marisol Ruiz of Ruiz Landscaping LLC. The advice was about her 2024 estimated payments, sent sometime in the fall of 2024.

Each search below follows Google’s Gmail operators or Microsoft’s Outlook search syntax, both checked October 4, 2026.

Two details trip people up. Outlook wants its logic words in capitals. Microsoft’s page says:

“logical operators such as AND, NOT, and OR must be in uppercase letters.”

So ruiz OR landscaping works, and ruiz or landscaping looks for the word “or.”

The other is the client’s name. Clients write from a personal address, a business address and sometimes a spouse’s. Search the business name as well as the person: ruiz OR "ruiz landscaping". If the business has its own domain, a search on the domain catches everyone who writes from it.

Searching what the firm said, not just what you said

“What did we tell her?” is a question about Sent mail across several people. Your own from:me search only covers your part.

At a five- or ten-person firm, the quick path is a message to the two or three people who touch that client. Give them the search to paste, so each one runs the same thing:

Can you run from:me to:ruiz after:2024/09/01 before:2025/01/01 estimate in your mail and forward anything that comes up? Marisol says we told her to skip the Q4 2024 estimate.

That takes each person a minute. It’s faster than asking an administrator, and it keeps the answer in one thread you can read before you reply.

When the person who sent it has left

Staff turnover is the reason a two-year-old email goes missing at a firm. The advice was good, the person who gave it moved on, and their mailbox went with them unless somebody decided otherwise.

Whether you can still find it depends on what the firm did when they left. Both big suites give you a way to keep the mail.

Microsoft 365. Microsoft’s guidance for a former employee’s Outlook data lists three routes: export the mailbox and import it into a colleague’s, convert it to a shared mailbox, or forward new mail to someone else. The shared mailbox is the one most firms want. Microsoft’s conversion page says:

“When you convert a user’s mailbox to a shared mailbox, all of the existing email and calendar information is retained. Only now it’s in a shared mailbox where several people will be able to access it instead of one person.”

Without a license, a shared mailbox holds up to 50 GB. The former user’s account has to stay, because it anchors the shared mailbox.

Google Workspace. Google’s page on preserving former employee data lists a data migration that moves the mail into another account:

“You can transfer the email data from the old user account to a new or existing user account.”

It also lists Vault export and an Archived User license. One line in Google’s Vault help is worth reading before anyone tidies up accounts:

“If you delete a user, you also delete that user’s Google Workspace data, including data held or retained by Vault.”

So the account a departed manager used in 2024 is worth keeping until the firm has decided what happens to their mail. If you’re the partner, that decision is yours to ask about now, while nobody needs it. What happens to a person’s seat and access when they leave belongs to team and admin.

Searching every mailbox at once

When the question is serious, one mailbox isn’t enough. A penalty dispute, a malpractice question or a records request means you want every copy, from everyone who wrote to the client.

That’s an archive search, and your administrator runs it. In Google Workspace it’s Vault. Google’s Vault overview says:

“With Vault, you can retain, hold, search, and export users’ Google Workspace data.”

In Microsoft 365 it’s Purview eDiscovery. Its keyword query reference has a handle your own Outlook doesn’t: participants, which covers From, To, Cc and Bcc. It takes a whole domain. So participants:ruizlandscaping.com finds every message to or from anyone at the client’s business, in every mailbox the firm holds. Purview also takes date ranges such as received>=2024-09-01 AND received<=2024-12-31, and attachment names with attachmentnames:.

Archive search is more than you need for an ordinary question. It’s the right tool when you need to say “this is everything.”

Finding the attachment, and the notice inside it

Half the time the thing you want isn’t the email. It’s the projection you attached, the engagement letter, or the IRS notice the client forwarded as a scan.

Outlook reads inside many attachments. Microsoft’s syntax page says:

“When you type words into the Search box, Outlook scans both email messages and many types of attachments for that word or phrase.”

So a word inside a Word file or a text-based PDF can bring up the email that carried it. Gmail’s filename: finds attachments by name or type, such as filename:pdf or filename:xlsx.

Scanned notices are the hard case. A client photographs a letter from the IRS or the state, and the image has no text for search to find. Search for what’s around the scan instead:

• The client’s words. “Got this letter from the IRS” or “letter from the state” usually sits in the email body.
• The forward. If the client sent it to the preparer, who forwarded it to the manager, search for the forward in the manager’s mail.
• Your reply. Whoever answered probably named the notice type and the tax year. Your reply is text, so it’s findable.

Where the firm’s copy of a notice should live, and how long the firm keeps it, are separate questions. They belong to your records policy, and what the rules ask of attachments covers the safeguards side.

A subject-line habit that makes the next search easy

The best time to make a 2028 search easy is today. One shared convention, used by everybody at the firm, turns a twenty-minute hunt into a single search.

Put three things at the front of any subject line where the firm gives advice or sends a deliverable:

1. The client code the firm already uses in its software, such as RUIZ01.
2. The tax year the email is about, such as TY2024. This is often a different year from the date the email was sent.
3. The topic, from a short list everyone uses.

That gives a subject like RUIZ01 TY2024 estimates: Q4 payment. Two years later, subject:RUIZ01 subject:TY2024 estimates finds it in Gmail. subject:RUIZ01 estimates gets you most of the way in Outlook.

A short topic list beats a long one, because people remember it. Here’s a starting set:

The tax year matters most. A client asking about 2024 means the 2024 tax year, and the email about it may have gone out in April 2025. A sent-date search misses that. A TY2024 tag catches it.

Write the convention down in one line of the firm’s procedures, and add it to new-hire onboarding. It only works when everyone uses it, including partners. How a solo practice files client mail by label is a different job, covered in filing client email in a tax practice.

Searching by meaning, and where it stops

Keyword search finds the words you remember. AI search finds what was meant, even when the email used other words. “Did we tell Marisol to skip a payment?” is that kind of question, because the email may have said “no need to send the December voucher.”

Both big suites now offer a version of this, with limits that matter at a firm.

Copilot in Outlook works in your own mailbox. Microsoft’s FAQ says:

“Copilot scenarios in Outlook are only available on a user’s primary mailbox. They are not available on a user’s archive mailbox, group mailboxes, or shared and delegate mailboxes that they have access to.”

So a departed manager’s mailbox, converted to shared, sits outside it. So does an online archive, which is where a lot of two-year-old mail ends up.

AI Overviews in Gmail search answer a question above your results. Google’s help page says they can “synthesize information scattered across multiple emails.” They need an eligible Workspace plan and work only in English. They also step aside when you use operators:

“If you use search operators, like is:unread or from:, the AI Overview isn’t available.”

So you choose per search between a precise keyword search and an answer in a sentence.

The strongest tools do both. Hybrid search runs keyword matching and meaning matching together and merges them. That matters for a firm, because client codes, EINs and notice numbers are exactly what meaning search handles badly. Searching by meaning explains why.

Whatever tool answers, open the original email before you rely on it. A two-year-old answer that turns into a client reply deserves the client’s exact words in front of you.

Before you answer the client

Finding the email is half the job. Before you write back, check four things:

• Who else was on the thread. The partner copied in 2024 may remember a phone call that changed the advice.
• What came after it. A later email may have corrected the first one. Read to the end of the thread, not just the message the search found.
• What happened off email. Portal messages and call notes don’t show up in a mailbox search. Check the client’s record in your practice software.
• Whether it’s a request. “Send me everything you told us about this” from a client may be a records request, and that has a clock. How soon a CPA must return client records covers it.

If the thread runs to forty messages, read a summary first and then the key emails. Picking up a thread a colleague started covers how to check a summary before you rely on it.

How Point answers “what did we tell them?”

Point connects to the Gmail or Microsoft 365 mailbox you already use, so your 2024 mail is right where it was.

You ask in plain words. “What did we tell Marisol Ruiz about her fourth-quarter estimate in 2024?” Point reads your mail and answers in a sentence. Every answer carries its receipt. One click and you’re on the original email, so the exact words are in front of you before you reply.

Follow-ups stay in the conversation. Point remembers what you were asking. “Did she reply?” narrows the last answer instead of starting over.

Point reads the attachment. The figure you need is on page two of a projection PDF. Ask for it, and Point gives you the figure with a link to the file.

Files gather in one place. Point’s Documents list collects the files that matter from your mail, named and dated. Each file’s card shows the thread it came from, so the projection and the email that explained it stay together.

One box searches everything. Command-K opens one search over mail, tasks, calendar and files. Type “Ruiz” and the emails, the task and last fall’s meeting sit in one list.

Each person’s Point reads their own mailbox. So “what did we tell her” covers the mail that reached you, and a colleague asks their own Point about theirs. The forward is still how a thread moves between two people at the firm. More on asking questions of files is in asking questions of your attachments.

When another tool fits better

Some firms want every client email visible to every staff member, by default. A practice management system is built around that. Karbon, for example, added a setting in 2019 to share all of a user’s emails with any contacts in Karbon, so a client’s history sits on the client record. That answers “what did we tell them” across the firm in one place. The trade is that everyone sees everything, by design.

If what you need is every copy firm-wide, for a dispute or a records request, the archive is the right tool. Vault and Purview search every mailbox the firm holds, and Point doesn’t replace them.

For the everyday question, asked by one person about a client they work with, your own search or Point is enough. Everything else Point does is on the benefits page, and you can join the beta to try it on your own mail.

Common questions

How can a CPA firm quickly search past client emails?

Start with who sent it. Search your own Sent mail with the client’s name, the year and one word from the advice. Ask colleagues who touch the client to run the same search and forward what they find. For a departed employee’s mail or every copy firm-wide, ask your administrator for a Vault or Purview search.

How do I find an email a former employee sent to a client?

It depends on what the firm did with their mailbox. In Microsoft 365 it may have been converted to a shared mailbox you can be given access to. In Google Workspace the mail may have been migrated to another account or kept with an Archived User license. If the account was deleted, Google says the data held by Vault is deleted with it.

Can Outlook or Gmail search inside attachments?

Microsoft says Outlook scans “many types of attachments” as well as messages. Gmail’s filename: finds attachments by name or file type. Neither reads a scanned image, so search for the email around a scanned notice instead.

What should CPA firms put in email subject lines to find them later?

The client code, the tax year and a topic word, at the front of the subject. For example: RUIZ01 TY2024 estimates: Q4 payment. The tax year matters most, because the email about a year’s return often goes out the following spring.

Can AI search my colleagues’ mailboxes?

Usually not. Microsoft says Copilot in Outlook works only on your primary mailbox, not shared or delegate mailboxes. Point reads your own mailbox too. For mail across the firm, use a forward, a practice management system that shares email, or an administrator’s archive search.

How far back can a CPA firm search email?

As far back as the firm keeps mail. Anything still in a mailbox, archived or not, is searchable by whoever can open that mailbox. Once a deleted message leaves the trash, an ordinary search won’t find it. A retention policy or a Vault or Purview hold may still have a copy, and only an administrator can reach that.