Users signed up to Exchange Online and Office 365 will now receive bigger mailboxes, after Microsoft announced it would double their storage for free.
The firm said users signed up to its service plans will now receive 50GB for their primary mailboxes, up from 25GB, at no extra cost.
Those on the cheaper "Kiosk" tiers will go from 1GB to 2GB in primary mailbox storage.
Shared mailboxes and resource mailboxes now have more than double the capacity at 10GB of storage. Microsoft said the size of site mailboxes will stay the same.
Subscribers don't need to do anything to get the extra storage, with Microsoft automatically upgrading mailboxes from today and through to November.
"There's no price increase associated with this change," said marketing manager Stephen Brown. "Our doubling of your mailbox storage is simply part of our promise to continuously deliver value to our Office 365 customers."
Microsoft also awarded up to 25GB of extra storage to its paying SkyDrive users this week. The firm faces competition from Google and storage startup Box, which offers 100GB of storage for $5 a month. Google offers 30GB to business users signed up for Google Apps, starting at $5 per user a month.
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