Oli,
It all depends on your sync frequency. If you remove users from AD, CUCM will mark them as "delete pending".
CUCM garbage collector will rip these out 24 hrs later.
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_configuration_example09186a0080a57c4c.shtml
Every night at 3.15 am, an internal process called the Garbage Collector service runs. This process permanently deletes any account that has been in the
Inactive – Delete Pending state for over 24 hours. The Cisco Unified Communications Manager does not sync Active Directory passwords. Cisco Unified Communications Manager has no knowledge of Microsoft Active Directory encryption mechanism. Instead, in Cisco Unified Communications Manager 5.0, a default password of ciscociscoand a default PIN of 12345are assigned.
cheers
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