Microsoft: New User / User's Details take a Long Time to Update in Global Address List

Add these all together and you can have quite a lag in seeing new users in your GAL.
1. GAL generation (should happen at time of user creation but may be delayed by DC replication)
2. Offline address book generation (every 24 hrs)
3. OAB replicated to the CAS (can take up to 8 hours)
4. Outlook download of OAB (24 hours from last download)

<< Things you can do to reduce lag >>
a. Increase the OAB generation schedule (default is once a day @ 5:00 am)
* EMC –> Organization Configuration –> Mail Box –> Offline address Book <tab> –> Properties of OAB –> Click Customize next to Update schedule –> modify to fit your needs (be careful to not make it often)
* Sample script to set it to 4 times a day for every OAB (use caution as this could cause undue load on the server\client)
  * get-offlineaddressbook | set-offlineaddressbook -schedule “Sun.5:00 AM-Sun.6:00 AM, Sun.10:00 AM-Sun.11:00 AM, Sun.3:00 PM-Sun.4:00 PM, Sun.8:00 PM-Sun.9:00 PM, Mon.5:00 AM-Mon.6:00 AM, Mon.10:00 AM-Mon.11:00 AM, Mon.3:00 PM-Mon.4:00 PM, Mon.8:00 PM-Mon.9:00 PM, Tue.5:00 AM-Tue.6:00 AM, Tue.10:00 AM-Tue.11:00 AM, Tue.3:00 PM-Tue.4:00 PM, Tue.8:00 PM-Tue.9:00 PM, Wed.5:00 AM-Wed.6:00 AM, Wed.10:00 AM-Wed.11:00 AM, Wed.3:00 PM-Wed.4:00 PM, Wed.8:00 PM-Wed.9:00 PM”

b. Change OAB download interval in outlook
    1. On the Tools menu, point to Send/Receive, point to Send/Receive Settings, and then click Define Send/Receive Groups.
    2. Click New.
    3. Type a name for the custom group.
    4. Click your Exchange account, and then click to select the Include the selected account in this group check box.
    5. Under Select the options you want for the selected account group, make sure that the only check box that is selected is Download offline address book, and then click OK.
    6. In the Send/Receive Groups dialog box, click your new group.
    7. Under Setting for group Group_name, click to select only the Schedule an automatic send/receive every check box, and then enter the number of minutes.
    8. Under When Outlook is offline, click to clear the check boxes.
    9. Click Close.

<< Forcing update >>
1. Get-GlobalAddressList | Update-GlobalAddressList
2. Get-OfflineAddressBook | Update-OfflineAddressBook
3. Get-ClientAccessServer | Update-FileDistributionService
4. Download Full OAB in outlook
   * On the Tools menu, point to Send/Receive, and then click Download Address Book.
   * In the Offline Address Book dialog box, make sure that the Download changes since last Send/Receive check box is checked.
   * Click OK.