.. / X-ALT-DESC
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Description

Provides an alternate format for the DESCRIPTION property (an HTML body).

Type

TEXT

Example

X-ALT-DESC;FMTTYPE=text/html:<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML><BODY><a href="msteams:/l/chat/0/0?users=EMAIL" target="_blank">LinkText</a></BODY></HTML>

Clients

Outlook Desktop

Sanitizes dangerous HTML tags but not custom protocol links.

OWA

Sanitizes dangerous HTML tags including custom protocol links.

Google Web

Sanitizes dangerous HTML tags including custom protocol links.

Teams Desktop

Sanitizes dangerous HTML tags but not custom protocol links.

References

  • https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/ms-oxcical/d7f285da-9c7a-4597-803b-b74193c898a8