When you send pictures as attachments in Outlook, you can have some issues with size of your email. Some mail servers have strict limits for incoming and outgoing messages.
The best way to send pictures or any other large files is to share them on external resource such as Google Drive, and send a link, but even in Outlook you can try to reduce the size of the picture attachment.

Outlook, like other Office applications, supports AutoCorrect - a feature that allows Outlook to correct common spelling and typing errors and to replace characters with symbols. You also can use AutoCorrect as a shortcut, which means you can type a small string of characters and have those characters replaced by a longer string.

Outlook uses two features to resolve and complete names entered into email messages: AutoComplete and Autoresolution.

Search Folders let you to access the information in your mailbox more quickly, because, unlike the ordinal folders, they do not dictate that message should belong to a single folder.