This is a display glitch where New Outlook reports your storage as empty (0 of 0 GB) and then blocks sending or receiving. Refreshing the session usually fixes it. Jump to your situation below or work through the methods in order.
The New Outlook 0/0GB storage error is a glitch where the app incorrectly displays your mailbox storage as empty, zero of zero gigabytes, and then blocks you from sending or receiving as if the mailbox were full or unavailable. It is almost always a session or sync hiccup rather than a real storage problem: the app failed to read the quota from the server and defaulted to a wrong value. The fix is usually as simple as signing out and back in, which forces the server to recalculate and report the correct quota. Restarting the app, checking for updates, and confirming your actual mailbox usage in Outlook on the web cover the remaining cases. Because the underlying mailbox is fine, the goal is just to refresh the stuck quota reading.
New Outlook reads your mailbox quota from the server and shows it in the app. The 0/0GB error means that read failed or returned nothing, so the app shows zero of zero and, treating the mailbox as unusable, blocks sending and receiving.
It is a reporting glitch, not a full mailbox. The quota is fine on the server; the app just has a stale or empty reading. Signing out and back in makes the server send the correct figures, which clears both the wrong display and the block.
“The 0 of 0 GB thing looks alarming, like your mailbox vanished, but it is just a glitchy quota reading. The app failed to pull the real numbers from the server and panicked. Signing out and back in is the fix almost every time, it forces the server to hand over the correct quota and the block lifts. If you want to be sure your mailbox is genuinely fine, glance at Outlook on the web, where the real usage shows.”
The 0/0GB storage error is a glitchy quota reading, not a full mailbox, so sign out and back in to force the server to recalculate and report the correct figure, which lifts the block. Restart and update the app if needed, and confirm your real usage in Outlook on the web for peace of mind.
If signing out and in does not clear the 0/0GB reading and Outlook on the web confirms the mailbox is healthy, reset Outlook (new) from Settings to clear the cached quota state, then sign in again. You can also submit your error to us for a tailored fix.
