Hi Keith,

I found it on Pauls own GitHub
https://github.com/cunninghamp/EASTroubleshooter/blob/master/Start-EASTroubleshooter.ps1

HI Deep Saha, i didnt upgrade from Exchange 2013 however just in the last month i started having issues with a user that has over 13000 mailbox folders/subfolders (not of inbox as we delete everything older than 30 days in the inbox which would apply to subfolders) User native mail app on iphone not working well, typically going blank or having white spaces in the inbox eventually refreshing normally and the outlook app for ios not working well at all.
I am almost convinced it is related to the number of subfolders however i have not been able to find the proof of this.

After Upgradation from 2013 to 2016 Active Sync is unable to sync all Folders and Subfolders but can connect and also can see few folders.
Active Sync Logs say Sync Key is not matching or invalid.
I tried to create a new policy/rule to reset Sync Key but still the same issue.

Any suggestions here?

# Retrieve the mobile device statistics (this part can be slow)
$MobileDeviceStats = @(foreach ($mobiledevice in $MobileDevices) {Get-MobileDeviceStatistics $mobiledevice.Identity})

Write-Host “”
Write-Host -ForegroundColor White ” *** Mailbox Allow/Block Device ID List ***”
Write-Host “”

$AllowedDeviceIds = @($CASMailbox.ActiveSyncAllowedDeviceIds)
$BlockedDeviceIds = @($CASMailbox.ActiveSyncBlockedDeviceIds)

# Output the list of allowed device IDs
if ($AllowedDeviceIds.Count -gt 0) {
Write-ResultsToConsole -Pretext “Allowed Device IDs” -Result “$($AllowedDeviceIds.Count) devices”
#List each device ID and the device’s friendly name
foreach ($DeviceId in $AllowedDeviceIds) {
Write-Host “ID: $($DeviceId) ($(Get-MobileDeviceFriendlyName $DeviceId))”
}
}
else {
#If there are no allowed device IDs output a result of None
Write-ResultsToConsole -Pretext “Allowed Device IDs” -Result “None”
}

I have been troubleshooting an issue, as suddenly several users started receiving this email:

Your phone won’t be able to synchronize with the server via Exchange ActiveSync because of an access policy defined on the server.
Information about your mobile phone:
Device model: Outlook for iOS and Android
Device type: Outlook
Device ID:
Device OS: Outlook for iOS and Android 1.0
Device user agent: Outlook-iOS-Android/1.0
Device IMEI:
Exchange ActiveSync version: 14.1
Device access state: Blocked
Device access state reason: Global

When I check the device is still syncing, no issues.

Do you have a clue of the reason of this emails?

Thanks for the script that helps us a lot vefry help full, Please could you share a script that showoing mailboxes that use the active service sync and another that users use owa
Regards

the “excessive” sub folder issues are a general client issue, not directly related to activesync.