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From: https://products.office.com/en-us/compare-all-microsoft-office-products?tab=2

Also: https://products.office.com/en-us/compare-all-microsoft-office-products?tab=1

Also: https://products.office.com/en-us/business/compare-more-office-365-for-business-plans

Also: https://technet.microsoft.com/en-us/library/office-365-plan-options.aspx

by Office 365 Team, on April 15, 2015

From: https://blogs.office.com/2015/04/15/office-365-now-supports-larger-email-messages-up-to-150-mb/

you can change the default for your organization by adjusting the default message size restriction. 
Simply select recipients > mailboxes then click “. . .” and select Set default message size restrictions.

Outlook Web App (OWA) in Office 365 offers an easy way to “attach” a document as a link to where it’s saved on OneDrive for Business, a great option for sharing large files with your colleagues. 

From: https://superuser.com/questions/724096/outlook-2013-not-showing-emails-older-than-aprox-6months-old-in-any-folders

 Found the answer

File
account settings -> account settings
From the "account settings" window select the email account
Click Change
Under Offline settings move the slider to the far right till it reads "all"
Click Next
Restart outlook

From: https://portal.microsoftonline.com

From: https://support.office.com/en-us/article/Set-up-email-on-other-Internet-capable-phones-and-tablets-775748A1-0075-40FD-B630-1D2A84BE081A

SMTP    smtp.office365.com    587  TLS

From: https://technet.microsoft.com/en-us/library/dn554323(v=exchg.150).aspx

smtp.office365.com

Requirements for SMTP client submission

Authentication:                 You must be able to configure a user name and password to 
                                send email on the device.
Mailbox:                        You must have a licensed Office 365 mailbox to send email from.
Transport Layer Security (TLS): Your device must be able to use TLS version 1.0 and above.
Port:                           Port 587 (recommended) or port 25 is required and must be 
                                unblocked on your network. Some network firewalls or ISPs 
                                block ports—especially port 25

Email settings for clients
    POP
        Server name: outlook.office365.com
        Port: 995
        Encryption method: TLS
    IMAP
        Server name: outlook.office365.com
        Port: 993
        Encryption method: TLS
    SMTP
        Server name: smtp.office365.com
        Port: 587
        Encryption method: STARTTLS
    Direct Send
        domain-com.mail.protection.outlook.com
        domain-com.mail.eo.outlook.com (Kyocera)
        25
        Fortigate test
        diagnose log alertmail test
        https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365

From: https://community.office365.com/en-us/w/exchange/how-to-forward-email-in-office-365

First and foremost, it there are two main categories of forwarding you'll need to pick from:

Option 1:  Forwarding an Office 365 mailbox - this scenario is typical when you want an Office 
365 login, whether it is because you need one for another Office 365 service (like Skype for Business 
(formerly known as Skype for Business (formerly known as Lync)) or SharePoint), or because you 
eventually will move all your email to Office 365. 
Option 2:  Forwarding for a simple email address (without a mailbox) - this is beneficial when 
there is no need to store any email on Office 365 for the address, and there is no reason to 
create an Office 365 account.

From: https://community.office365.com/en-us/f/158/t/64555

Before going further, I’d like to clarify your detailed requirement.

1.There is custom domain ‘mydomain.com’ in the Office 365 tenant.

2.You prefer to have an email address ‘username@mydomain.com’ and this email address don’t relative any mailboxes. So this email address don't need license.

3.The mail, which is delivered to the address ‘username@mydomain.com’, will be delivered to external mail box like ‘username@hotmail.com’.

You can create a Distribution Group (DG) with address ‘username@mydomain.com’ and add the ‘username@hotmail.com’ to this DG. You can follow the steps below.

1.Add the ‘username@hotmail.com’ to the external contacts. After logging into Microsoft Online Portal, click manages under Exchange. Select tab ‘Users and Groups’ and click External contacts. You can add the ‘username@hotmail.com’ to the contacts. For more information, please refer the following link.
http://help.outlook.com/en-us/140/ms.exch.ecp.newcontact.aspx

From: https://support.godaddy.com/help/article/9015/updating-outlook-2007-and-2010-to-work-with-office-365

Also: https://www.microsoft.com/en-us/download/details.aspx?id=50360

Once setup just use email account to have Outlook automatically setup.

To Update Outlook 2007 and 2010 to Work with Office 365
Log in to your email address by going to http://email.[your domain name]/.
Click the Gear icon in the upper right, and then click Office 365 settings.
Click Software on the left, then click Desktop Setup.
Click the Setup button, and open the file that downloads.
Sign in to your Office 365 address.
Click Continue, then click I accept.
When the updates have completed, click Finish.