Reports are coming in that some Microsoft account users who use the company's mail clients are receiving errors related to a device synchronization limit that they have reached. Depending on the device and software used, error messages may read "There are too many devices syncing with this account", "There is an error syncing your mail account", "You can't connect this account to any more devices" or "We can'T add this account to your phone because you've already set it up on the maximum number of devices".
The Hotmail/Outlook/Windows Live synchronization issues are caused by an active sync partnership limit that is account-based. One of the causes for the issue seems to be that reinstallations of the operating system seem to cause the creation of new sync partnerships while the old synchronization links remain active.
Once the limit is reached, device syncing errors are displayed instead. While some users may be able to remove devices from the account that they no longer need, other's have received the error message with only one or two devices listed in their account.
What makes this problem particularly troublesome for the user is that there is no option to reset the sync partnerships client-side. According to some reports only specialized Microsoft tech support members can reset the sync partnerships to resolve the issue.
Most Microsoft support members on phone, forum or email are however not aware of the issue at all and won't escalate the issue unless you are persistent about it and even then, it may not work at all. If you are lucky enough, you need them to "reset the sync relationships" of the account to resolve the issue. This resets the sync points basically so that devices that you actually use sync emails again.
List of error messages:
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