[in, out] Specifies the number of characters in wszExpires. Returns the number of characters required to retrieve the value if wszExpires is too small, or returns the number of characters written.
wszExpires
[in, out, string, size_is(*pdwCcSince)] Returns the expires value for the FeedSync sharing information.
Sync Framework does not interpret or validate this value in any way.
The expires value represents the expiration date and time that are suggested by the feed publisher. To avoid missing item updates, subscribers must read the feed before it expires.