PowerShell – Change the update schedule for the GAL in Exchange

In my previous post I write about updating the GAL and OAB in Exchange.

But what if you want to change the default update schedule?
There’s a PowerShell command for that…

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”

This script will change the update schedule from once a day to 4 times a day.
Note that this may cause performance issues on you Exchange server and/or clients so use it wisely or change it to your liking

—- UPDATE —

I received feedback about this post from @JetzeMellema.
Warning taken from TechNet: “Frequent updating is generally not recommended because frequent updating may affect client and server performance”.

Please read the TechNet article before changing the GAL update schedule!!!