Search for	Example	Results
A single word	`cat`	Topics that contain the word "cat". You will also find its grammatical variations, such as "cats".
A phrase. You can specify that the search results contain a specific phrase.	`"cat food"` (quotation marks)	Topics that contain the literal phrase "cat food" and all its grammatical variations. Without the quotation marks, the query is equivalent to specifying an OR operator, which finds topics with one of the individual words instead of the phrase.

Search for	Operator	Example
Two or more words in the same topic	`AND` `and` `+` (plus symbol) `&` (ampersand)	`cat AND dog` `"cat food"+milk` `"cat food"&"dog food"`
Either word in a topic	`OR` `or` `\|` (pipe)	`cat OR dog` `cat \| dog`
Topics that do not contain a specific word or phrase	`NOT` `not` `!` (exclamation point)	`NOT cat` `! dog`
Topics that contain one string and do not contain another	`^` (caret)	`cat ^ mouse`
A combination of search types	`( )` parentheses	`cat + (dog \| mouse)` `cat \| dog + (! mouse)`

Universal DiscoveryContent Pack 28.00 (CP28)

Troubleshoot > Troubleshooting and Limitations – Discovery Modules > Troubleshooting and Limitations – Microsoft Exchange Server by PowerShell Discovery

Troubleshooting and Limitations – Microsoft Exchange Server by PowerShell Discovery

This section describes troubleshooting and limitations for Microsoft Exchange Server by PowerShell discovery.

Problem: No results brought, cmdlet calls end with errors like:
```
Active Directory error 0x80072020 occurred while searching for domain controllers in domain <Domain Name>: An operations error occurred.
```
```
+CategoryInfo :
```
```
+FullyQualifiedErrorId : 7D2B0C9D
```
Reason: The "Delegation" is not configured properly.

Solution: Configure Active Directory "Delegation" as described in How to Configure the Active Directory Side.
Problem: No results brought, cmdlet calls end with errors like:
```
Value cannot be null..
```
```
Parameter name: parameters
```
```
    + CategoryInfo :
```
```
+ FullyQualifiedErrorId : System.ArgumentNullException,Microsoft.Exchange.Management.SystemConfigurationTasks.GetExchangeServer
```
Reason: The "Delegation" is not configured properly or connection is performed from an untrusted domain or not all required patches are installed on the server (for more details, see the official Microsoft site).

Solution: Configure Active Directory "Delegation" as described in How to Configure the Active Directory Side, and check the patch-level. For more information, check the official Microsoft site.
Problem: Calls to the Exchange command-lets fail with timeouts and/or session gets broken.
```
An application cannot impersonate a user and then run Windows PowerShell commands in an Exchange Server 2007 environment.
```
Reason: This is a known Exchange 2007 bug.

Solution: To fix this problem, run Microsoft Patch KB943937, which is a part of MS Exchange 2007 SP1.

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