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Microsoft Graph connectors API limits

This article describes implementation and operational limits for Microsoft Graph connectors. Keep these limits in mind when designing connectors.

Connection limits

Limit type Limit
Connection resources per Microsoft 365 tenant 30
Items per connection 5,000,000
Connection byte size 500 GB
Items per tenant 50,000,000

Schema limits

Limit type Limit
Properties that can be defined in a schema, characterizing the data ingested through a connection 128

Group limits

Limit type Limit
External groups per Microsoft 365 tenant 100,000
Requests allowed per second (requests/sec) in the group administration throttling threshold 1,000
External groups per user for search query 10,000

Item ingestion

Limit type Limit
Throughput limit to ingest items through a connection 25 items/sec
Item size; this limit applies to the request body when ingesting and indexing an item 4 MB
Number of activities; this is the throttling threshold per activities call 20 activities
Property size N/A

Note: The 4 MB item size limit refers to the total size of parsed text content that is typically 10% of the original file size for common formats (for example, docx, ppt, and PDF). To contextualize, 4 MB equals 4,000,000 bytes that translates to approximately 600K-700K words or 1,400 pages (averaging 500 words per page).

Throttling

When a throttling threshold is exceeded, Microsoft Graph limits any further requests from that client for a period of time. When throttling occurs, Microsoft Graph returns HTTP status code 429 (Too many requests), and the requests fail. A suggested wait time is returned in the response header of the failed request.

Throttling behavior can depend on the type and number of requests. For example, if you have a high volume of requests, all request types are throttled. Threshold limits vary based on the request type. Therefore, you could encounter a scenario where writes are throttled but reads are still permitted.