Limits for Content Search in the Office 365 Security & Compliance Center

Note:  The limits in this topic are different from the current limits for In-Place eDiscovery in Exchange Online and for the eDiscovery Center in SharePoint Online.

Various limits are applied to the Content Search feature in the Office 365 Security & Compliance Center. This include searches run on the Content Search page and Content Searches that are associated with an eDiscovery case. These limits help to maintain the health and quality of services provided to Office 365 organizations. You can't modify these limits, but you should be aware of them so that you can take these limits into consideration when planning, running, and troubleshooting Content Searches.

The following table lists the search limits in the Security & Compliance Center.

Description of limit

Limit

The maximum number of mailboxes or sites that can be searched in a single Content Search

No limit

The maximum number of Content Searches that can run at the same time in your organization.

No limit1

The maximum number of items per user mailbox that are displayed on the preview page when previewing Content Search results.

100

The maximum number of items found in all user mailboxes that are displayed on the preview page when previewing Content Search results. The newest items are displayed.

1000

The maximum number of user mailboxes that can be previewed for search results. If there are more than 1000 mailboxes that contain content that matches the search query, only the top 1000 mailboxes with the most search results will be available for preview.

1000

The maximum number of items found in SharePoint and OneDrive for Business sites that are displayed on the preview page when previewing Content Search results. The newest items are displayed.

200

The maximum number of sites (in SharePoint and OneDrive for Business) that can be previewed for search results. If there are more than 200 total sites that contain content that matches the search query, only the top 200 sites with the most search results will be available for preview.

200

The maximum number of items per public folder mailbox that are displayed on the preview page when previewing Content Search results.

100

The maximum number of items found in all public folder mailboxes that are displayed on the preview page when previewing Content Search results.

200

The maximum number of public mailboxes that can be previewed for search results. If there are more than 500 public folder mailboxes that contain content that matches the search query, only the top 500 public folder mailboxes with the most search results will be available for preview.

500

The maximum number of keywords that can be specified in a Content Search query.

500

Maximum number of variants returned when using a prefix wildcard to search for an exact phrase in a keyword search query or when using a prefix wildcard and the NEAR or ONEAR Boolean operator. 2

10,000

The minimum number of alpha characters for prefix wildcards; for example, time*, one*, or set*.

3

Notes: 1   If you have to run multiple Content Searches against all mailboxes in your organization, we recommend that you run them one at a time.

2   For non-phrase queries (a keyword value that doesn't use double quotation marks) we use a special prefix index. This tells us that a word occurs in a document, but not where it occurs in the document. To do a phrase query (a keyword value with double quotation marks), we need to compare the position within the document for the words in the phrase. This means that we can't use the prefix index for phrase queries. In this case, we internally expand the query with all possible words that the prefix expands to; for example, "time*" can expand to "time OR timer OR times OR timex OR timeboxed OR …". 10,000 is the maximum number of variants the word can expand to, not the number of documents matching the query. There is no upper limit for non-phrase terms.

There are additional limits related to different aspects of Content Search, such as exporting search results and content indexing. For a description of these limits, see the following topics:

For information about Content Searches, see:

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