[Email Security] Updated references to Office 365

[Maddy-Cloudflare]

This PR aims at replacing instances of O365 or Office 365 with M365 or Microsoft 365.

[github-actions]

This PR changes current filenames or deletes current files. Make sure you have redirects set up to cover the following paths:

• /cloudflare-one/email-security/setup/post-delivery-deployment/api/office365-api/
• /cloudflare-one/email-security/setup/post-delivery-deployment/bcc-journaling/journaling-setup/office365-journaling/
• /cloudflare-one/email-security/setup/pre-delivery-deployment/prerequisites/office365-email-security-mx/

[hyperlint-ai]

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PR Change Summary

Updated references from Office 365 to Microsoft 365 across various documentation files to ensure consistency and accuracy.

• Replaced all mentions of 'Office 365' with 'Microsoft 365' in the documentation.
• Updated titles and content to reflect the change from Office 365 to Microsoft 365.
• Modified links to ensure they point to the correct Microsoft 365 resources.

Modified Files

• src/content/docs/cloudflare-one/email-security/email-monitoring/search-email.mdx
• src/content/docs/cloudflare-one/email-security/outbound-dlp.mdx
• src/content/docs/cloudflare-one/email-security/setup/post-delivery-deployment/bcc-journaling/journaling-setup/manual-add.mdx
• src/content/docs/cloudflare-one/email-security/setup/post-delivery-deployment/bcc-journaling/journaling-setup/office365-journaling.mdx
• src/content/docs/cloudflare-one/email-security/setup/pre-delivery-deployment/egress-ips.mdx

Renamed Files

• src/content/docs/cloudflare-one/email-security/setup/pre-delivery-deployment/prerequisites/microsoft365-email-security-mx.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/public/__redirects	@GregBrimble, @KianNH, @pedrosousa, @WalshyDev, @cloudflare/pcx-technical-writing
/src/content/docs/cloudflare-one/	@ranbel, @cloudflare/pcx-technical-writing
/src/content/docs/learning-paths/	@cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://735b32ce.preview.developers.cloudflare.com
Preview Branch URL: https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/email-security/setup/pre-delivery-deployment/egress-ips/	https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com/cloudflare-one/email-security/setup/pre-delivery-deployment/egress-ips/
https://developers.cloudflare.com/cloudflare-one/email-security/setup/post-delivery-deployment/bcc-journaling/journaling-setup/m365-journaling/	https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com/cloudflare-one/email-security/setup/post-delivery-deployment/bcc-journaling/journaling-setup/m365-journaling/
https://developers.cloudflare.com/cloudflare-one/email-security/setup/post-delivery-deployment/api/m365-api/	https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com/cloudflare-one/email-security/setup/post-delivery-deployment/api/m365-api/
https://developers.cloudflare.com/cloudflare-one/email-security/setup/post-delivery-deployment/bcc-journaling/journaling-setup/manual-add/	https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com/cloudflare-one/email-security/setup/post-delivery-deployment/bcc-journaling/journaling-setup/manual-add/
https://developers.cloudflare.com/cloudflare-one/email-security/setup/	https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com/cloudflare-one/email-security/setup/
https://developers.cloudflare.com/cloudflare-one/email-security/setup/pre-delivery-deployment/mx-inline-deployment-setup/	https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com/cloudflare-one/email-security/setup/pre-delivery-deployment/mx-inline-deployment-setup/
https://developers.cloudflare.com/cloudflare-one/email-security/setup/pre-delivery-deployment/prerequisites/microsoft365-email-security-mx/	https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com/cloudflare-one/email-security/setup/pre-delivery-deployment/prerequisites/microsoft365-email-security-mx/
https://developers.cloudflare.com/cloudflare-one/email-security/email-monitoring/	https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com/cloudflare-one/email-security/email-monitoring/
https://developers.cloudflare.com/cloudflare-one/email-security/email-monitoring/search-email/	https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com/cloudflare-one/email-security/email-monitoring/search-email/
https://developers.cloudflare.com/cloudflare-one/email-security/outbound-dlp/	https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com/cloudflare-one/email-security/outbound-dlp/
https://developers.cloudflare.com/cloudflare-one/email-security/retro-scan/	https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com/cloudflare-one/email-security/retro-scan/
https://developers.cloudflare.com/learning-paths/secure-o365-email/get-started/deployment-models/	https://maddy-email-security-pcx-17956.preview.developers.cloudflare.com/learning-paths/secure-o365-email/get-started/deployment-models/