SUMMARY

When you change a password or disable a mailbox the effect is not immediate and may take up to 120 seconds to take effect, depending on when the mailbox was last logged onto.

DETAIL

With some types of client access, such as when using CalDAV and ActiveSync, the client sends credentials on each request. This can cause more load on the authentication system, so the authentication system caches credentials for 120 seconds (by default) for successful authentication attempts. Each service or program using the authentication provider has its own cache. If a login is enabled or disabled, then a user connecting with the correct credentials will not see this take effect until the cached entry expires. This can take up to 120 seconds.

SOLUTION

If you require this to work differently you are able to either disable the credential caching or lower the cache timeout. The registry settings are below. These may need to be added. You will need to restart all the mail services for the change to take effect:

For 64bit Windows:

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Mail Enable\Mail Enable\Providers\Authentication]
"Credential Cache Enabled"=dword:00000001
"Credential Cache Expiration"=dword:00000078

For 32bit Windows:

[HKEY_LOCAL_MACHINE\SOFTWARE\Mail Enable\Mail Enable\Providers\Authentication]
"Credential Cache Enabled"=dword:00000001
"Credential Cache Expiration"=dword:00000078