Check your zimbraLastLogonTimestampFrequency (default is 7d to cutdown on ldap writes every time you auth...)
It's your call - you can set it to values like: 1d, 1h, 1m, 1s, or 0 for disabled.
Quote:
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zmprov mcf zimbraLastLogonTimestampFrequency 3d
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See also
Bug 24012 - "Last logged in" not updating when using external LDAP fixed for 5.0.3