AddSync AI vs Microsoft Copilot
Both help people work with email and calendars. They are built for different setups. Here is an honest look at where each one fits.
Copilot is the natural choice when every mailbox is in Microsoft 365. AddSync AI is for companies with Exchange Server on site, mixed systems, or a wish to use Claude or ChatGPT under their own rules.
Side by side
What matters most for a company mailbox.
Vendor products change. The statements about other products are based on their public documentation in October 2026, so check the current terms before you decide.
Where Copilot is the better choice
If all your people work in Microsoft 365, use Outlook, Word, Teams and Excel every day and want one assistant across all of them, Copilot is built for that. It lives inside the apps. AddSync AI does not try to replace that.
Where AddSync AI fits
Many companies are not fully in the cloud. They run Exchange Server on site, use Gmail for some teams, or keep HCL Domino. Others want to let people use Claude or ChatGPT but need IT to decide what the AI may see.
- Your mailboxes are on Exchange Server and cannot be moved yet.
- You use more than one mail system.
- You want a guard, filters and a journal that you control.
- You prefer licences per account, not per product bundle.
You can also use both: Copilot for people who are in Microsoft 365, and AddSync AI for the rest.
Questions
Does Microsoft Copilot work with on-premises Exchange?
According to Microsoft, Copilot is cloud based and has no access to on-premises mailboxes. The mailbox has to be in Exchange Online. Read the full explanation on our on-premises Exchange page.
Can I use AddSync AI and Copilot together?
Yes. They do not conflict. Some people can use Copilot in Microsoft 365, while others on Exchange Server or Gmail use AddSync AI.
Can AddSync AI send emails for me?
No. It can search, show, save a draft and propose. Sending is done by the person.
Which one is cheaper?
It depends on your numbers. AddSync AI is licensed per account, Copilot needs a Microsoft 365 licence and a Copilot licence per user. See our pricing and compare with your Microsoft quote.
Does AddSync AI work in Microsoft 365 too?
Yes. Microsoft 365 is one of the supported systems, next to Exchange Server, Gmail, Outlook.com and HCL Domino.
Try it on your own mailbox
A 14-day pilot with a few mailboxes shows more than any comparison.