Outlook clients periodically trying to connect to hard-coded autodiscover links ...

Hello,
We have an different internal and external domain names, e.g., company.local and company.com respectively. All our users have both @company.local and @company.com e-mail addresses but @company.com is the
primary SMTP address. We have two AD sites, s1 and s2. Our SCP records appear to be fine and point to autodiscover-s1.company.local and autodiscover-s2.company.local and we have DNS entries for them.
For various reasons, we use a first-time logon script with Redemption Profman to create the Outlook profile with a specific name. It works fine, the profile is created the first time the user logs on.
However, if we scan the firewall logs, we see that *some* clients are periodically trying to connect to "autodiscover.company.com" as well as autodiscover-s1/s2.company.local and we can't understand why. We don't have DNS entries for "autodiscover.company.com".
Strangely, the clients appear to work fine, the users don't complain about anything.
Presumably, that comes from the right-hand side of the user's email address. Can anyone explain why Outlook is doing that for users on domain-joined PCs?
We migrated from Exchange 2003; we have Exchange 2010 latest SP/RU and Outlook 2010 with latest patches too. The issue affects Outlook 2011 Mac users too.
If we use the autodiscover instead of the logon script, it does create a working profile. The Test Configuration in Outlook doesn't show any problems either or mention autodiscover.company.com. This problem seems to happen when Outlook uses autodiscover
to connect periodically and scan for changes (the "outlook layer" and "MAPI layer" in the documentation). Repairing or re-creating the profiles doesn't change anything.
Thanks in advance for any suggestions,
- Alan.

This is the order of autodiscover search in outlook
1. Try to access DC to get the autodiscover scp
2. Local DNS to locate autodiscover.emaildomain.com
3. Local XML
4. SRV record
If the user is not joined to domain or out of domain network outlook will search for 
https://domain.com/autodiscover/autodiscover.xml 
https://autodiscover.domain.com/autodiscover/autodiscover.xml
May be you might have mentioned external DNS in your PCs or it may be logs of external user access
MAS

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