Preserving Text Messages and Emails as Evidence in an Ontario Lawsuit

Most disputes today leave a digital trail — a string of texts about a deal gone wrong, an email chain where someone admitted a mistake, or a message thread that shows exactly when things fell apart. That trail can make or break a case. But phones get replaced, chat apps quietly delete old messages, and inboxes get "cleaned up" long before anyone thinks about a lawsuit.

Preserving texts and emails as evidence in Ontario starts well before you ever file a claim. If the messages disappear, so does your best proof of what was actually said and when.

This guide covers what counts as preservable digital evidence, the practical steps to lock it down, and when your obligation to keep it actually begins.

Why Digital Communications Get Lost

Digital messages disappear for reasons that have nothing to do with anyone trying to hide something:

• Messaging apps quietly delete messages after a set period, or once storage fills up
• A phone is lost, damaged, traded in, or wiped during a factory reset
• Email providers archive or purge old messages under a routine retention policy
• A new phone or app migration does not carry over every old conversation
• Someone deletes an embarrassing or unhelpful message without thinking about a future dispute

None of that matters to a judge later. If a message that would have supported your version of events is gone, the court works with what is left — which may not be much.

What Counts as Preservable Evidence

Almost any digital communication that touches on the dispute can matter, including:

• Text messages and messaging-app chats (iMessage, WhatsApp, Facebook Messenger, and similar)
• Emails, including attachments and read receipts
• Voicemail transcripts or recordings, where available
• Calendar entries and meeting invitations tied to the events in question
• Direct messages on social platforms

The metadata attached to a message — timestamps, sender and recipient, and whether it was edited or deleted — often matters as much as the words themselves.

Step-by-Step: How to Preserve a Message Thread

1. Stop deleting anything related to the dispute. Turn off auto-delete settings on messaging apps where you can, and do not archive-and-forget.
2. Take full-thread screenshots, not just the one message you think matters. Capture the sender's name or number, the date and time stamps, and enough surrounding context to show the conversation is not taken out of context.
3. Export where you can. Many platforms let you export a full chat history or email thread as a file rather than relying on screenshots alone.
4. Back up the device itself. Do not sell, trade in, or wipe a phone or computer that holds relevant messages until you have spoken with a lawyer about the dispute.
5. Save the original file format when possible, alongside screenshots, since the underlying data can sometimes confirm authenticity in a way a screenshot alone cannot.
6. Store copies somewhere durable — a separate cloud account, an external drive, or with your lawyer — so a single lost or damaged device does not take the evidence with it.

What Not to Do

• Do not edit, crop, or "clean up" a screenshot before saving the original
• Do not delete messages you think make you look bad — this can look far worse later than the message itself
• Do not rely on the other side to have kept their own copy
• Do not wait until you have decided to sue; by then, relevant messages may already be gone

When the Duty to Preserve Begins

Ontario's basic limitation period generally gives you two years from when a claim is discovered to start a lawsuit — as of mid-2026, always confirm the current rule for your specific type of claim — but that is about when you can sue, not about when you should start protecting evidence. Once a dispute is serious enough that a lawsuit is a realistic possibility, courts generally expect a party to take reasonable steps to preserve relevant records, even before a claim is filed. Waiting until messages have already been deleted rarely goes over well if the case proceeds.

Some claims carry a much shorter deadline than the general two-year rule — defamation is one well-known example — so do not assume you have plenty of time to sort out your evidence later.

Frequently asked questions