QB Issue Resolution:

there are various reasons why Outlook may not show up as an option for sending email. The article below might help.

http://support.quickbooks.intuit.com/support/articles/SLN40771

Resolution for Issue 'Upgrade to qb2015 pro and find that i cant change the option under send email using. when I go into edit preferences – send forms. Any one else encountered this problem.' available: Yes (Solved).
Source: Intuit Community forum.

Upgrade to qb2015 pro and find that i cant change the option under send email using. when I go into edit preferences – send forms. Any one else encountered this problem.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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