# Office 365 developer accounts: add 1 free year to your new/existing account

> After Build 2015, Microsoft’s new Office Dev mailing list offered a free year of an Office 365 Developer account, and you can add it to an existing one.

Source: https://ali.id.au/blog/office-365-developer-accounts-add-1-free-year-to-your-newexisting-account/ (last edited 2026-10-16)

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Post Build 2015, Microsoft has quietly started the Office Dev Mailing List, with an introductory offer of one free year of a 365 Developer account (typically around $9/mo).

You can actually add this free year to your existing 365 Dev account.

Simply [sign up here](https://web.archive.org/web/20150503011207/http://dev.office.com/devprogram) using your personal MS account, log in, find the dev program sign up form, and look for the link at the top of the page that says _“add to Existing Account”_. Click that link, sign in to your dev account, and accept and apply the “one month trial”. You’ll soon receive a “Welcome to your trial” email confirming the one year trial period.