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Troubleshooting IMAP Connectivity: Unable to authenticate to IMAP server. IMAP command failed: Login failed.

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The first step is to check if the  Courier  IMAP server is accepting connections. Open a terminal window and type: telnet hostname 143 Replace  hostname  with the  IMAP  server's  DNS  name. This expected results would look like this: $ telnet imap.example.com 143 If you get the error "no login failed" then you need to check the following; 1. Make sure IMAP Service is running. 2.  You should make sure that you are using the correct password and that the mail username is in the format: 3. Make sure there is correct name in your exchange server certificate. Please check your certificate settings: Get-ExchangeCertificate | fl I noticed that the InternalConnectionSettings is pointed to Test2.contoso.com but the X509CertificateName is using Remote.domain.com. If there is a certificate with Test2.contoso.com, please change the X509CertificateName to it to have a try: Set-IMAPSettings -Identity Test2\1  -X509CertificateName Test2.contoso.com T...
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Faulting application name: hostcontrollerservice.exe, version: 16.0.775.0, time stamp: 0x5211bea8 Application Error Faulting application name: hostcontrollerservice.exe, version: 16.0.775.0, time stamp: 0x5211bea8 Faulting module name: KERNELBASE.dll, version: 6.2.9200.17637, time stamp: 0x56980227 Exception code: 0xe0434352 Fault offset: 0x000000000004b418 Faulting process id: 0x4878 Faulting application start time: 0x01d2a139409a0421 Faulting application path: D:\Program Files\Microsoft\Exchange Server\V15\Bin\Search\Ceres\HostController\hostcontrollerservice.exe Faulting module path: C:\Windows\system32\KERNELBASE.dll Report Id: 80ceb831-0d2c-11e7-950e-005056be650e Faulting package full name: Faulting package-relative application ID: Solution: Stop the Microsoft Exchange Search service and Microsoft Exchange Search Host Controller (this one probably already is). Edit the file installconfig located in C: \ Program Files \ Microsoft \ Exchange Server \ V15 \ Bin \ Search \ Ceres \ Ins...
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How to Configure ActiveSync Virtual Directories in coexistence between exchange 2007 and 2013, when you have different external and internal namespaces

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In coexistence environment (exchange 2007-2013), we could set Exchange 2013 ActiveSync External URL to mail.yourexternaldomain.com and set Internal URL to mail.yourinternaldomain.com . And set Exchange 2007 Internal URL to  mail.yourinternaldomain.com  and set External URL to Null .  We could run the following commands. Set-ActiveSyncVirtualDirectory -Identity "<CAS2013>\Microsoft-Server-ActiveSync (Default Web Site)" -ExternalUrl "https:// mail.yourexternaldomain.com /Microsoft-Server-ActiveSync"    –InternalURL “https:// mail.yourinternaldomain.com /Microsoft-Server ActiveSync” Set-ActiveSyncVirtualDirectory -Identity "<CAS2007>\Microsoft-Server-ActiveSync (Default Web Site)" -ExternalUrl $Null    –InternalURL “https:// mail.yourinternaldomain.com  /Microsoft-Server-ActiveSync”
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